A 15-year-old Bayonne boy who had been hiding out at his grandmother's house in Newark was arrested this morning in the savage beating by a teen mob that left Bayonne man Dawid Strucinski in a coma, Bayonne police said.

The boy has been charged with aggravated assault, rioting and endangering an injured victim, said police, who did not provide any details on how they found the boy in Newark. Police said the boy's grandmother was not there when the boy was apprehended.

The teen is the ninth person arrested in the July 3 early morning attack on Strucinski, 22, who was coming to the aid of a friend when the gang of teens turned on him. Strucinski, a recent Rutgers University graduate who is planning on a career in law enforcement, is in a coma in the Jersey City Medical Center.

Of the nine people arrested so far, only one, Derrick Hilton, 18, is an adult. Police have said that they believe 13 people took part in the assault.